We are using a Multiplus 12/3000/120-50 120v Inverter powered by Battleborn batteries that are showing 100% full (600Ah).
ISSUE: Approximately 15 secs after turning power on to our Bosch 3000 T water heater, the inverter flashes the low battery light, then the overload light flashes. The inverter stops working.
While it is on with power requested by the water heater, the SmartBMV software shows current = -120A, Power = -1454W.
Note: When I plug the water heater into an extension cord from our house, the Kill-A-Watt shows 10.85A 1235W.
Note: The water heater is on its own circuit. We use other circuits. For example, one for a microwave that appears to be working as expected.
I am looking for guidance/advice on how to get this AC circuit working as expected. The challenge does not appear to be the water heater since it works fine when powered from our house.